Last I heard was that camping res. were sold out and that just because you have a camp res. doesn't mean you'll get a beach pass on any given day, you'd think that if you are already on the beach camping your good to go but the vehicle needs the pass to be roaming the dunes and they spot check, if they get ya you can not leave the vehicle at camp it has to be off beach. Others report they drove in, nobody at kiosk, went to favorite spot, camped & rode all weekend, never a word, point is that just because you get there doesn't mean your rig will make it onto beach. There may be busy weekends and days that get more scrutinized than slow times as well.
Looking forward to seeing all the Toyotas on the beach that shows up the weekend of 11/5, we are staying at the Oceano campground.
As long as you check in at the ranger station first thing in the morning, you shouldn't have any problem getting on the beach for the day.